Ladder



FIG. 1 is a perspective view of a ladder, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is an in-use image of the ladder on a van.

The broken lines shown in the figures are for the purpose of illustrating a portion of the ladder that forms no part of the claimed design. The broken lines showing a portion of a van in FIG. 8 are for the purpose of illustrating environment and form no part of the claimed design. 

CLAIM I claim the ornamental design for a ladder, as shown and described. 